Valve-seat



(No Model.) v J. H. McGOWAN.

VALVE SEAT.

N0. 486L600. Patented Nov. 22, 1 92.

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UNITED STAT S PATENT OFFI E;

JOHN H. MOGOWAN, or CINCINNATI, OHIO.

VALV E- S EAT.

SPECIFICATION forming part of Letters Patent No. 486,600, dated November22, 1892.

Application filed December 21, 1891. $erial No. 415,786. (No model.) i

.To all whom it may concern.-

Be it known that I, JOHN H. MOGOWAN, a citizen of the United States,residing at Oincinnati, Ohio, have invented new and useful Improvementsin Valve-Seats, of which the following is a specification.

My invention relates to the class of flatdisk check valves employed inpumping mechanism seating upon the flat marginal surface of thevalve-port in a plane at right angles with the axis of the port. Suchvalves are usually guided by a central stein held in a spider securedacross the valve-aperture. As the function of such spider is merely tosustain a central boss, from which the guidestem projects upwardly, theconstruction involves radial wings connecting and merging into thecentral boss and the bounding wall of the cylindrical aperture. In somecases a cage valve is employed, the valve being cup-shapedand guided ina concentric series of ribs prolonged upward parallel with thecylindrical plane of the valve-aperture. Such valves have no centralguide-stem, and consequently the valve-seat aperture is entirely openand unobstructed.

My invention has more particular reference to these two classes ofvalves.

In more recent practice, in order to avoid the clacking noise, (whencethe original name of such valves was derived,) the firstdescribed valvesare wholly made of hard rubber faced with a softer layer of the samematerial, and the latter class are of metal, to the seating-face ofwhich a layer of rubber is secured.

In the first-named valves, guided upon a central stem, the radial wingsacquire a new function-namely, that of furnishing a support for the fiatdisk, which, Without such intervening support at the center and thenceto the circumference, would be depressed or crushed centrally by thesuperincumbent pressure. This is especially the casein pumps workingunder heavy pressure, (where this construction and material are chieflyused,) and the tendency is much increased when, as in boiler-feeders,&c., warm or hot water is pumped, owing to the softening efiect of heaton material of the nature referred to. By repeated pressure under theseconditions those portions of the rubber facing lying upon the marginalseat, central boss, and radial support soon become compacted anddepressed, while the intervening portions become correspondingly raised,as illustrated in the drawin gs hereinafter referred to, so that thevalveface becomes a matrix, in which the surface contour of the spideris more or less deeply impressed, the radial depressions 0c,corresponding with the Wings d, being separated by ridges 1corresponding with the wateropenings 2', between the wings projectingbeyond the proper face. So long as the valve might maintain its originalradial position in relalation t0 the spider this would present nodifficulty; but as it is not desirable to employ a feather-and-slotconstruction or other device to maintain such radial relation upon itsguide-stem, because of increased friction and consequent liability ofthe valve to stick, the original position is not preserved. The swirlingof water in its passages through the valve-seat and the jumping of thevalve under pressure often displace the valve, so that its ridges restupon the radial wings and the valve becomes leaky and inelficient. Whenpriming occurs or air leaks into the passages, the pump often refuses towork and it becomes necessary to cease operations, open the valvecasing,and restore the valves to their proper position with a liability tosimilar displacement immediately or at any time.

The second-described class of valves are subject when faced with ayielding material to a further dangernamely, it is impracticable to sounite the facing-layer of yielding material with the metal of the valveitself as to prevent the interposition of the water, whichsoon separatesthe two and by its pressure misshapes and destroys the facing-layer, sothat the valves become inoperative and useless.

. The object of my invention is to provide a remedy for both thedefective conditions above described; and it consists in a valveseatwherein are formed one or more concentrio supporting-faces interposedbetween its central axis and the marginal seat proper, thesupporting-surfaces being in or approximately in a common plane with themarginal seat, and in the combination therewith of a fiat disk valvecomposed of or faced with rubber or other comparatively-yieldingmaterial and free to rotate upon said seat. Idispense with the radialwings as supportsfor the valve and employ them in modified form andposition only to support the concentric wings whose upper faces furnisha support for the valves.

Mechanism embodying my invention is illustrated in the accompanyingdrawings, in Which- Figure l is a plan of my improved valve-seat,showing one concentric supporting-ring interposed between the centralboss and marginal valve-seat. Fig. 2 is an axial section of my improvedvalve-seat with the valve seated thereon; Fig. 3, a plan view of the oldstyle of valve-seat, with a corresponding perspective bottom view of thevalve lifted therefrom, showing the radial depressions and ridges,illustrating one of the defective conditions which my invention isdesigned to overcome; and Fig. 4, an axial section of a cage-valve andseat, showing my improvement applied thereto in relation to a valvefaced with a rubber layer.

Referring now to the drawings, Adesignates a flat disk-valve, of hardrubber, of the class first herein described, centrally pierced to riseand fall upon the guide-stem a, and B designates the valve-seat providedwith a central boss I), one or more concentric rings 0, and two or moreradial su pporting-wings d. The stem a usually carries a spiral spring8, held by a nut or head a at the upper end of the stem and bearingagainst the top of the valveA to assist in holding it to its seat uponthe marginal surface e of the valvge-port. The concentric rings a andthe central boss I) have their upper faces in a common plane, orapproximately so, with the marginal valve-seat e, the face of thecentral boss b being practicallya seat in relation to the centralopening of the valve to prevent leakage at that point. The ribs d, notbeing required as direct supports for the valve, are dropped down belowwhereby it maintains a true seat under all circumstances. I introduce asimilar construction in cage-valve seats, as shown in Fig. 4, where adisk-valve is faced with a layer f of rubber. The construction beingotherwise such as I have already described need not be further detailed.The number of concentric supports 0 will be governed by the size of thevalve-seat openings, the degree of pressure and other obvious conditionsrequiring no detailed reference.

I claim as my invention and desire to secure by Letters Patent of theUnited States 1. A valve-seat fordisk lift-valves provided with acentral boss for a guide-stem and one or more concentricsupporting-rings within the port-openings, having their supporting-facesin or approximately in the plane of the boss and marginal seat and beingthemselves sustained by supports wholly below said plane, substantiallyas set forth.

2. In combination with a flat disk valve composed of or faced withrubber or other my hand in the presence of two subscribing witnesses.

JOHN H. MCGOWAN. Witnesses:

L. M. I'IOSEA, E. HosEA.

